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Date:   Mon, 13 May 2019 10:20:19 -0700
From:   Eric Dumazet <>
To:     Mark Rutland <>
Cc:     "David S . Miller" <>,
        Alexei Starovoitov <>,
        Daniel Borkmann <>,
        netdev <>,
        Eric Dumazet <>,
        bpf <>, syzbot <>,
        Petar Penkov <>,
        Stanislav Fomichev <>
Subject: Re: [PATCH net] flow_dissector: disable preemption around BPF calls

On Mon, May 13, 2019 at 10:17 AM Mark Rutland <> wrote:
> On Mon, May 13, 2019 at 09:38:55AM -0700, 'Eric Dumazet' via syzkaller wrote:
> > Various things in eBPF really require us to disable preemption
> > before running an eBPF program.
> Is that true for all eBPF uses? I note that we don't disable preemption
> in the lib/test_bpf.c module, for example.
> If it's a general requirement, perhaps it's worth an assertion within

The assertion is already there :)

This is how syzbot triggered the report.

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